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gotwind
Forum Admin
United Kingdom
958 Posts |
 Posted - 27/12/2007 : 22:41:54
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I have a few free days, I am attempting a vertical axis wind generator - notoriously difficult to do well..
I should get a couple of amps @ 12v in good wind, using the 'coggless' axial flux alternator - 25 watts tops I suspect.
http://www.gotwind.org/Axial_Flux_Alternator.htm
May be a better option in my turbulent wind urban location, we will see.
Ben.
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frankineto
Starting Member
United Kingdom
17 Posts |
 Posted - 28/12/2007 : 12:27:38
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Hi
good luck with the build and no , not so easy to build .
some guy over in Australia , has recently been commsioned in I think new south wales to build one like this and it was horizontal rather than vertical and he has got alot of publicity , but i can't remember his name . I am sure the local botough might want some ideas hint hint
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fungus
Moderator
301 Posts |
Posted - 28/12/2007 : 12:28:08
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| Peter's alternator is nice but as you said it was designed for a cutin of 450rpm, so unless you're charging NiCds or have a form of boost converter then it wont match well with a vawt. |
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gotwind
Forum Admin
United Kingdom
958 Posts |
Posted - 28/12/2007 : 13:26:28
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Yes, true.
May be o.k for 6 volt - bit of an experiment really while the weather is mild and I am able to tinker...
Surprisingly windy here today also. |
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gotwind
Forum Admin
United Kingdom
958 Posts |
Posted - 28/12/2007 : 15:13:29
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Had a rethink, as Fungus pointed out, the 450 rpm is way too fast for a vawt.
It has now become a hawt using the old soil pipe prop design from ages ago, plenty of speed with this size - 31" diameter.
http://www.gotwind.org/Soil_Prop.htm
First tests were very promising holding by hand (not advised) because the axial design doesn't suffer from any cogging.
Ben. |
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Peter Williams
New Member
United Kingdom
54 Posts |
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gotwind
Forum Admin
United Kingdom
958 Posts |
Posted - 28/12/2007 : 18:36:59
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I wouldn't be too disheartened Peter,
With any wind generator it is important to match the propeller to the generator.
In my case I was governed by a too higher speed alternator design and I didn't want to use gears/pulleys to increase the rpm using a vawt design.
That eBay traeadmill motor looks pretty good, coupled to a fairly large vawt design could work, I suspect you would only need to gear it about 3:1
Still better to make a horizontal design from that motor, it would be far more efficient.
Ben. |
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My latest project
